2024 Tianjin Question 4 Single-choice Differentiating 2024_天津 Paper 4. 下列函数是偶函数的是( ) A. $y = { \frac { \operatorname { e } ^ { x } - x ^ { 2 } } { x ^ { 2 } + 1 } }$B. $y = { \frac { \cos x + x ^ { 2 } } { x ^ { 2 } + 1 } }$C. $y = { \frac { \mathbf { e } ^ { x } - x } { x + 1 } }$D. $y = { \frac { \sin x + 4 x } { \mathrm { e } ^ { | x | } } }$ Answer keyB ☆ SaveCan't do it, show the explanation查看原卷 →